The covers have a unique thermometer to help regulate cooking temperature. That means when you are trying to juggle a dozen kitchen chores while cooking, a simple glance at the thermometer tells you immediately if everything is fine. Better yet, you can stack cook with this cookware. That means you can start cooking on one burner and then stack the pan on top of another pan when it reaches cooking temperature, freeing up a burner. Limited lifetime warranty. White box. ​